mine was doing it in reverse terrible, took the pads off and found 2 little pebbles wedged up in there on each side. No more squealing for now but i'm sure it will return after a few trips to the creek. I carry a can of BrakeKleen with also[;)]

I keep telling people this, but I usually get people telling me not to do it. Spray wd-40 in the caliper and it will stop the squeal for about a week or two. When it starts back spray it again. Cheap way to fix squeaking brakes and it WONT affect braking. I have been doing this for awhile now and no reduced braking. but no brake noise. hope this helps